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Investments and fair value measurements
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Investments and fair value measurements
4. Investments and fair value measurements

The Company’s assets and liabilities that are measured at fair value on a recurring or nonrecurring basis within the fair value hierarchy are as follows (in thousands):
As of March 31, 2024
Level 1Level 2Level 3
Current assets:
Cash equivalents:
Money market funds$217,979 $— $— 
Marketable securities:
U.S. government securities$— $173,883 $— 
Non-current assets:
Strategic investments$— $— $10,311 
Non-current liabilities:
Cash settled stock appreciation rights
$— $— $22 

As of December 31, 2023
Level 1Level 2Level 3
Current assets:
Cash equivalents:
Money market funds$266,692 $— $— 
Marketable securities:
U.S. government securities$— $171,372 $— 
Non-current assets:
Strategic investments$— $— $10,311 
Non-current liabilities:
Cash settled stock appreciation rights$— $— $48 
The Company’s money market funds are classified within Level 1 of the fair value hierarchy because they are valued using quoted prices in active markets. The Company’s investments in U.S. government securities are classified within Level 2 of the fair value hierarchy because they have been valued using inputs other than quoted prices in active markets that are directly or indirectly observable. The Company’s strategic investment is classified within Level 3 of the fair value hierarchy because it has been valued using significant unobservable inputs for which the Company has been required to develop its own assumptions.
The changes in the fair value of Level 3 financial instruments, of which remeasurement of SARs and impairment of strategic investments are recognized in the consolidated statements of operations, was immaterial for the three months ended March 31, 2024.
The Company evaluates its strategic investments for impairment at each reporting period. This evaluation consists of several potential qualitative and quantitative impairment indicators including, but not limited to, the investee's financial metrics, whether there were any significant adverse changes in the economic environment or general market conditions of the geographies and industries in which the investee operates, and any other publicly available information that may affect the value of the investment. No impairment losses were recorded in the three months ended March 31, 2024 or 2023.
The difference between the strategic investment’s cost basis of $15.0 million and the carrying value of $10.3 million is due to cumulative impairment charges of $4.7 million, of which $1.8 million was recorded during the second quarter of 2023, and $2.9 million was recorded during the third quarter of 2022.